Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Held to Maturity (Detail) (USD $)	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, amortized cost of investments sold	$ 68,700,000
Held-to-maturity securities, net realized gain (loss)	95,000
Amortized Cost	21,704,000	112,391,000
Gross Unrealized Gains	0	98,000
Gross Unrealized Losses	0	(43,000)
Fair Value	21,704,000	112,446,000
Corporate Bond
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0	91,730,000
Gross Unrealized Gains	0	98,000
Gross Unrealized Losses	0	(43,000)
Fair Value	0	91,785,000
Perfect Home Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	21,704,000	20,661,000
Fair Value	$ 21,704,000	$ 20,661,000